SDL2/dialogs/sdl_buttons.cpp

#include <cassert>
#include <algorithm>
 
#include "sdl_buttons.hpp"
 
static const Uint32 hpadding = 10;
 
SdlButtonList::~SdlButtonList() = default;
 
bool SdlButtonList::populate(SDL_Renderer* renderer, const std::vector<std::string>& labels,
                             const std::vector<int>& ids, Sint32 total_width, Sint32 offsetY,
                             Sint32 width, Sint32 height)
{
  assert(renderer);
  assert(width >= 0);
  assert(height >= 0);
  assert(labels.size() == ids.size());
 
  _list.clear();
  size_t button_width = ids.size() * (width + hpadding) + hpadding;
  size_t offsetX = total_width - std::min<size_t>(total_width, button_width);
  for (size_t x = 0; x < ids.size(); x++)
  {
    const size_t curOffsetX = offsetX + x * (static_cast<size_t>(width) + hpadding);
    const SDL_Rect rect = { static_cast<int>(curOffsetX), offsetY, width, height };
    _list.emplace_back(renderer, labels[x], ids[x], rect);
  }
  return true;
}
 
SdlButton* SdlButtonList::get_selected(const SDL_MouseButtonEvent& button)
{
  const Sint32 x = button.x;
  const Sint32 y = button.y;
 
  return get_selected(x, y);
}
 
SdlButton* SdlButtonList::get_selected(Sint32 x, Sint32 y)
{
  for (auto& btn : _list)
  {
    auto r = btn.rect();
    if ((x >= r.x) && (x <= r.x + r.w) && (y >= r.y) && (y <= r.y + r.h))
      return &btn;
  }
  return nullptr;
}
 
bool SdlButtonList::set_highlight_next(bool reset)
{
  if (reset)
    _highlighted = nullptr;
  else
  {
    auto next = _highlight_index++;
    _highlight_index %= _list.size();
    auto& element = _list[next];
    _highlighted = &element;
  }
  return true;
}
 
bool SdlButtonList::set_highlight(size_t index)
{
  if (index >= _list.size())
  {
    _highlighted = nullptr;
    return false;
  }
  auto& element = _list[index];
  _highlighted = &element;
  _highlight_index = ++index % _list.size();
  return true;
}
 
bool SdlButtonList::set_mouseover(Sint32 x, Sint32 y)
{
  _mouseover = get_selected(x, y);
  return _mouseover != nullptr;
}
 
void SdlButtonList::clear()
{
  _list.clear();
  _mouseover = nullptr;
  _highlighted = nullptr;
  _highlight_index = 0;
}
 
bool SdlButtonList::update(SDL_Renderer* renderer)
{
  assert(renderer);
 
  for (auto& btn : _list)
  {
    if (!btn.update(renderer))
      return false;
  }
 
  if (_highlighted)
    _highlighted->highlight(renderer);
 
  if (_mouseover)
    _mouseover->mouseover(renderer);
  return true;
}